I'm going to say Lewis Dunk.
He seems to have matured as a player, and become a fantastic defender, from the great defender he was last season.
Throwing himself on the line at every chance. OK, four own goals look a little harsh on his stats.
But he seems not to be making those rash challenges like he did last season and getting suspended. So that's a fantastic improvement against all these top players and teams.
He will either be with us for years and years to come, and be club captain.
Or some team will come in with an offer that we can't refuse in the future!
Between him and Knockaert for the complete season but in fairness AK has improved since Everton (a) but prior to that he was cack.